summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/atmel-hlcdc.c
blob: 20de7f49a8309f51c729aeb99b2aa390be54feb1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Free Electrons
 * Copyright (C) 2014 Atmel
 *
 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
 */

#include <linux/clk.h>
#include <linux/iopoll.h>
#include <linux/mfd/atmel-hlcdc.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

#define ATMEL_HLCDC_REG_MAX		(0x4000 - 0x4)

struct atmel_hlcdc_regmap {
	void __iomem *regs;
	struct device *dev;
};

static const struct mfd_cell atmel_hlcdc_cells[] = {
	{
		.name = "atmel-hlcdc-pwm",
		.of_compatible = "atmel,hlcdc-pwm",
	},
	{
		.name = "atmel-hlcdc-dc",
		.of_compatible = "atmel,hlcdc-display-controller",
	},
};

static int regmap_atmel_hlcdc_reg_write(void *context, unsigned int reg,
					unsigned int val)
{
	struct atmel_hlcdc_regmap *hregmap = context;

	if (reg <= ATMEL_HLCDC_DIS) {
		u32 status;
		int ret;

		ret = readl_poll_timeout_atomic(hregmap->regs + ATMEL_HLCDC_SR,
						status,
						!(status & ATMEL_HLCDC_SIP),
						1, 100);
		if (ret) {
			dev_err(hregmap->dev,
				"Timeout! Clock domain synchronization is in progress!\n");
			return ret;
		}
	}

	writel(val, hregmap->regs + reg);

	return 0;
}

static int regmap_atmel_hlcdc_reg_read(void *context, unsigned int reg,
				       unsigned int *val)
{
	struct atmel_hlcdc_regmap *hregmap = context;

	*val = readl(hregmap->regs + reg);

	return 0;
}

static const struct regmap_config atmel_hlcdc_regmap_config = {
	.reg_bits = 32,
	.val_bits = 32,
	.reg_stride = 4,
	.max_register = ATMEL_HLCDC_REG_MAX,
	.reg_write = regmap_atmel_hlcdc_reg_write,
	.reg_read = regmap_atmel_hlcdc_reg_read,
	.fast_io = true,
};

static int atmel_hlcdc_probe(struct platform_device *pdev)
{
	struct atmel_hlcdc_regmap *hregmap;
	struct device *dev = &pdev->dev;
	struct atmel_hlcdc *hlcdc;

	hregmap = devm_kzalloc(dev, sizeof(*hregmap), GFP_KERNEL);
	if (!hregmap)
		return -ENOMEM;

	hlcdc = devm_kzalloc(dev, sizeof(*hlcdc), GFP_KERNEL);
	if (!hlcdc)
		return -ENOMEM;

	hregmap->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(hregmap->regs))
		return PTR_ERR(hregmap->regs);

	hregmap->dev = &pdev->dev;

	hlcdc->irq = platform_get_irq(pdev, 0);
	if (hlcdc->irq < 0)
		return hlcdc->irq;

	hlcdc->periph_clk = devm_clk_get(dev, "periph_clk");
	if (IS_ERR(hlcdc->periph_clk)) {
		dev_err(dev, "failed to get peripheral clock\n");
		return PTR_ERR(hlcdc->periph_clk);
	}

	hlcdc->sys_clk = devm_clk_get(dev, "sys_clk");
	if (IS_ERR(hlcdc->sys_clk)) {
		dev_err(dev, "failed to get system clock\n");
		return PTR_ERR(hlcdc->sys_clk);
	}

	hlcdc->slow_clk = devm_clk_get(dev, "slow_clk");
	if (IS_ERR(hlcdc->slow_clk)) {
		dev_err(dev, "failed to get slow clock\n");
		return PTR_ERR(hlcdc->slow_clk);
	}

	hlcdc->regmap = devm_regmap_init(dev, NULL, hregmap,
					 &atmel_hlcdc_regmap_config);
	if (IS_ERR(hlcdc->regmap))
		return PTR_ERR(hlcdc->regmap);

	dev_set_drvdata(dev, hlcdc);

	return devm_mfd_add_devices(dev, -1, atmel_hlcdc_cells,
				    ARRAY_SIZE(atmel_hlcdc_cells),
				    NULL, 0, NULL);
}

static const struct of_device_id atmel_hlcdc_match[] = {
	{ .compatible = "atmel,at91sam9n12-hlcdc" },
	{ .compatible = "atmel,at91sam9x5-hlcdc" },
	{ .compatible = "atmel,sama5d2-hlcdc" },
	{ .compatible = "atmel,sama5d3-hlcdc" },
	{ .compatible = "atmel,sama5d4-hlcdc" },
	{ .compatible = "microchip,sam9x60-hlcdc" },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, atmel_hlcdc_match);

static struct platform_driver atmel_hlcdc_driver = {
	.probe = atmel_hlcdc_probe,
	.driver = {
		.name = "atmel-hlcdc",
		.of_match_table = atmel_hlcdc_match,
	},
};
module_platform_driver(atmel_hlcdc_driver);

MODULE_ALIAS("platform:atmel-hlcdc");
MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
MODULE_DESCRIPTION("Atmel HLCDC driver");
MODULE_LICENSE("GPL v2");